I was very skeptical about the w829...I wanted a top of the range TV to go in my new place. OLED, 4k, something.
Wife ended up convincing me to go with the w829 for 'now'. So glad I did, it's an absolutely awesome TV. Deep rich blacks, no noticeable backlight bleed which from an LED is pretty hard to come by as you know. I don't watch sports so can't comment on its performance there but for movies, general tv, and htpc use it's superb and I only paid £617 for 55" so really even more happy about that.
Go for it, for the price you won't regret it!